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#include <bits/stdc++.h>
#define forn(I,P,K) for(int (I)=(P);(I)<=(K);++(I))
using namespace std;
int main()
{
    ios_base::sync_with_stdio(0);
    int n,k,w=2020,a;
    cin>>n>>k;
    forn(i,1,n) forn(j,1,i)
    {
        cin>>a;
        if(j*(i-j+1)<=k)    w=min(w,a);
    }
    return cout<<w,0;
}